linux-kernel - Re: [PATCH 7/7] KVM: Change return type of kvm_arch_vm

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Message-ID: <20230208183549.145b708d@p-imbrenda>
Date:   Wed, 8 Feb 2023 18:35:49 +0100
From:   Claudio Imbrenda <imbrenda@...ux.ibm.com>
To:     Thomas Huth <thuth@...hat.com>
Cc:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        kvmarm@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 7/7] KVM: Change return type of kvm_arch_vm_ioctl() to
 "int"

On Fri,  3 Feb 2023 10:42:30 +0100
Thomas Huth <thuth@...hat.com> wrote:

> All kvm_arch_vm_ioctl() implementations now only deal with "int"
> types as return values, so we can change the return type of these
> functions to use "int" instead of "long".
> 
> Signed-off-by: Thomas Huth <thuth@...hat.com>

Acked-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>

> ---
>  arch/arm64/kvm/arm.c       | 3 +--
>  arch/mips/kvm/mips.c       | 4 ++--
>  arch/powerpc/kvm/powerpc.c | 5 ++---
>  arch/riscv/kvm/vm.c        | 3 +--
>  arch/s390/kvm/kvm-s390.c   | 3 +--
>  arch/x86/kvm/x86.c         | 3 +--
>  include/linux/kvm_host.h   | 3 +--
>  7 files changed, 9 insertions(+), 15 deletions(-)
> 
> diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
> index 9c5573bc4614..e791ad6137b8 100644
> --- a/arch/arm64/kvm/arm.c
> +++ b/arch/arm64/kvm/arm.c
> @@ -1449,8 +1449,7 @@ static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
>  	}
>  }
>  
> -long kvm_arch_vm_ioctl(struct file *filp,
> -		       unsigned int ioctl, unsigned long arg)
> +int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
>  {
>  	struct kvm *kvm = filp->private_data;
>  	void __user *argp = (void __user *)arg;
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index a25e0b73ee70..84cadaa2c2d3 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -1003,9 +1003,9 @@ void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm,
>  	kvm_flush_remote_tlbs(kvm);
>  }
>  
> -long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
> +int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
>  {
> -	long r;
> +	int r;
>  
>  	switch (ioctl) {
>  	default:
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index 04494a4fb37a..6f6ba55c224f 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -2386,12 +2386,11 @@ static int kvmppc_get_cpu_char(struct kvm_ppc_cpu_char *cp)
>  }
>  #endif
>  
> -long kvm_arch_vm_ioctl(struct file *filp,
> -                       unsigned int ioctl, unsigned long arg)
> +int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
>  {
>  	struct kvm *kvm __maybe_unused = filp->private_data;
>  	void __user *argp = (void __user *)arg;
> -	long r;
> +	int r;
>  
>  	switch (ioctl) {
>  	case KVM_PPC_GET_PVINFO: {
> diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c
> index 65a964d7e70d..c13130ab459a 100644
> --- a/arch/riscv/kvm/vm.c
> +++ b/arch/riscv/kvm/vm.c
> @@ -87,8 +87,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
>  	return r;
>  }
>  
> -long kvm_arch_vm_ioctl(struct file *filp,
> -		       unsigned int ioctl, unsigned long arg)
> +int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
>  {
>  	return -EINVAL;
>  }
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 8ad1972b8a73..86ca49814983 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -2850,8 +2850,7 @@ static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
>  	return r;
>  }
>  
> -long kvm_arch_vm_ioctl(struct file *filp,
> -		       unsigned int ioctl, unsigned long arg)
> +int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
>  {
>  	struct kvm *kvm = filp->private_data;
>  	void __user *argp = (void __user *)arg;
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index caa2541833dd..c03363efc774 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -6653,8 +6653,7 @@ static int kvm_vm_ioctl_set_clock(struct kvm *kvm, void __user *argp)
>  	return 0;
>  }
>  
> -long kvm_arch_vm_ioctl(struct file *filp,
> -		       unsigned int ioctl, unsigned long arg)
> +int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
>  {
>  	struct kvm *kvm = filp->private_data;
>  	void __user *argp = (void __user *)arg;
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 4f26b244f6d0..ed2f1f02976b 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1398,8 +1398,7 @@ int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
>  			bool line_status);
>  int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
>  			    struct kvm_enable_cap *cap);
> -long kvm_arch_vm_ioctl(struct file *filp,
> -		       unsigned int ioctl, unsigned long arg);
> +int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg);
>  long kvm_arch_vm_compat_ioctl(struct file *filp, unsigned int ioctl,
>  			      unsigned long arg);
>